<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script type="text/javascript">
			/*let show = (a) => a;
			alert(show(123))*/
			
			/*let show = (a,b) => a+b
			alert(show(12,18))*/
			
			/*document.documentElment.onclick = show;
			function show(){
				alert(this)
			}*/
			
			function show(){
				alert(arguments.length)
			}
			showe(1,2,3)
			
		</script>
	</head>
	<body>
	</body>
</html>
